Overseaming sewing-machine



. (No Model.) 2 Sheets-Sheet 1.

P. DIEHL. OVERSEAMING SEWING MACHINE. Elm 478,994.

' Patened July 19, 1892.

(N9v Model.) 2 Sheets-Sheet 2.

P. 'DIEHL. OVERSBAMING SEWING MAUHINE.

--"N'o. 479,994. Patented July 19, 1892.

UNITED STATES PATENT OFFICE.

PHILIP DIEHL, OF ELIZABETH, NEWV JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY OF NEW JERSEY.

OVERSEAMING SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No.'478,994, dated July 19, 1892. Application filed April 6, 1891. Serial No. 387,793. (No model.)

To all whom it may concern.-

Be it known that I, PHILIP DIEHL, a citizen of the United States, residing at Elizabeth,in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Overseaming Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings. 7

My invention relates to that class of sewing-machines in which the needle-bar is moved horizontally to cause it to descend in different vertical planes in overseaming,working buttonholes, or doing ornamental or fancy stitching; and my invention has for its object to provide means for preventing the needle from getting out.0f time from the shuttle or looper co-operating therewith when wide overseaming-stitches are being formed and when the horizontal movements of the needle are very considerable, the needle and shuttle or looper, it being understood, being operated from a common driving-shaft. In machines of the class referred to as heretofore constructed more or less difficulty has been experienced in forming wide over-seams, owing to the fact that the needle when working in one or the other of its different vertical planes would be slightly out of time from the shuttle or looper, thereby causing liability of ship ping stitches, and this is the difficulty which my invention has for its object to obviate.

In carrying my invention into effect I provide means for so compensating for the differences of position of the needle relative to the path of movement of the shuttle or looper that the eye of the needle will always be at about the same distance below the point of the shuttle or looper when aloop of needle-thread is to be taken in whichever of its different vertical planes the needle may be working.

In the drawings, Figure 1 is asectional side View of an overseaming-maohine embodying my invention. Fig. 2 is a bottom View thereof. Fig. 3 is a front end view of the same with the face-plate removed. Figs. 4: and 5 are detail horizontal sectional views with the needle-bar in different positions to show the movement of the compensating mechanism between the needle-bar and its operating-pit man. Figs. 4: and 5 are detail views illustrating the relative positions of the needle and point of the shuttle when the needle-bar is beginning to rise in the different vertical planes denoted by Figs. 4 and 5, respectively. Fig. 6 is a diagram to illustrate the different positions of the needle-bar-operating crankpin when the needle and shuttle are in the positions shown by Figs. 4: and 5. Fig. 7 is a diagram to illustrate the relative vertical positions of the center of the driving-shaft and the center of the end of the needle-bar stud. Fig. 8 is a detail View to show the connections of the needle-bar-frame operatingcam with the driving-shaft.

A denotes the work-plate, B the bracketarm, and O the driving-shaft journaled in the upper part q of said arm and connected by bevel-gears 0 (Z with the vertical shaft D, provided at its lower end with the crank (1', connected by the pitman E with an armf of a rocking sleeve F, having a second arm f provided with flanges, between which is received astud on an arm 9 of a short verticalshuttleoperating rock-shaft G, said shaft Gr, having at its upper end the shuttle-carrier g, receiving the oscillating shuttle H, working in the horizontal race h. The driving-shaft 0 carries a second bevel-gear c, meshing with a larger bevel-gear formed on a disk I, journaled on a stud 2', and provided in its outer face with a cam-groove t", entered by a stud on a rocker F, to which the rear end of the pitman J is adj ustably connected, the forward end of said pitman being attached to the rocking needle-bar frame K, pivoted on the center screws lo. As the cam disk I is geared to the driving-shaft C so as to rotate once while thesaid shaft turns twice, the needle-bar N, mounted in the frame K and carrying the needle 12, will be caused to descend in different vertical planes alternately, said needle-bar being connected by the pitman L with the crank-pin 0 carried by the disk 0 on the forward end of the shaft 0.

The mechanism thus far described is common to the well-known Singer overseamingmachine, in which, as heretofore constructed, the block m, to which the needle-bar is attached, had a long stud loosely entering a hole in the lower end of the pitman L, and which stud merely slid back and forth in its bearing in the pitman as the needle-bar was moved in and out or reciprocated horizontally, said stud remaining; at all times par allel with the longitudinal axis of the driving shaft C. In the present instance the block on is provided with a rearwardly-extending fork m, embracing a stationary rod 0, fixed on the head of the machine, and the said block carries a stud m as heretofore, excepting that said stud is furnished at its end with a ball m, which enters the aperture in the lower end of the pitman L, and which thus permits said stud to rock without binding in the pitman. Thus as the needlebar is moved in and out to descend in its different vertical planes the stationary rod 0, embraced by the fork m of the block m, will cause said block to rock horizontally, and thus the stud m will swing back and forth from the position shown in Fig. at to the position shown in Fig. 5, and vice versa, the needle-bar turning in its vertical bearings in the frame K as it is rocked back and forth. In other words, the block m, to which the needle-bar is attached and which may be said to carry the said needlebar, is a lever of the third class, the rod 0 being the fulcrum thereof, while the needle-bar, which is carried in and out by the swinging frame K, is the power by which said block or lever is vibrated to cause the stud m to vibrate back and forth horizontally, the said stud forming an arm converting the said block or lever into a bellcrank lever.

In the position shown in Figs. 4 and at the needle is at its innermost position (or at its right-hand position, referring to Fig. 1) and the shuttle is moving forward, as denoted by the arrow in Fig. I to take a loop of needlethread at the moment when the needle is beginning to rise.

1n the position shown in Figs. 5 and 5 the needle is at its outermost positionabontonefourth of an inch (in making a rather wide seam) to the left (with reference to Fig. 1) of the position shown in Figs. 4. and t--and as the shuttle when the needle is rising is moving forward, as before, its point It meets the needle considerably earlier with reference to the rotation of the driving-shaft than at the previous stitch.

To insure certainty of operation and to pre vent skipping stitches, it is necessary that the eye of the needle should bej ust below the point of the shuttle at themoment thelatter reaches the needle; but when the needle has a considerable horizontal movement, as is necessary in making a wide overseam, the variation in the timing of the needle and shuttle is so much that unless compensated for, so that the needle-eye will always be at about the same distance below the shuttle-point when the loop is taken, skipping of stitches is liable to occur. Thus if the parts he rightly timed for the position denoted in Fig. 4'' they will be out of time for the position denoted in Fig. 5, for the reason that when in thclattcr position the needle should descend a little earlier (with reference to the rotation of the driving-shaft) than when in the former.

Referring now to Fig. 4, the longitudinal axis of the stud m is shown to be parallel with the longitudinal axis of the driving-shaft and is central directly below the same, as denoted by the vertical line t in Fig. 7; but in Fig. 5 the free end of said stud is farther to the right, so thatits center with relation to the center of the said shaft is denoted by the inclined line 5 in Fig. 7. The needle-bar will be at its lowest point inits downward movement when the crank-pin (:2 is in the same vertical plane with the ball m which forms the connection between the block m, secured to the needle-bar, and the lower end of the pitman L, by which the needle-bar is operated. The ball m is shown in Fig. t as being directly central beneath the driving-shaft C; but in Fig. 5 it is shown as being somewhat to the right of the center of the said driving-shaft, the two positions of the said ball being approximately represented by the diagram Fig. 7. It will therefore be apparent that when the needle-bar is swirngoutward, as shown in Fig. 5, and its point of connection with the pitman Lto wit, the bal1m -is thrown farther to the right the crank-pin c and the said ball on will come into the same vertical plane earlier in the rotation of the driving shaft than when the stud m is in the position denoted in Fig. i. From this it results that as the driving-shaft isrotating in the direction denoted by the arrows, Figs. 6 and 7, the needle-bar will be at its lowest point of descent slightly earlierin the rotation of the driving-shaft when the stud is in the inclined position shown in Fig. 5 than when in the straight position shown in Fig. 4, as the outer end thereof is farther to the right or toward the direction from which the crank-pin c is coming. This operation is fin'therillustratcd in the diagram Fig. 6, in which the line 42 denotes the position of the crank-pin c with relation to the center of the driving-shaft when the point of the shuttle meets the me dle, as the latter is rising when the parts are as shown in Figs. 4t and 4c, and the line 5 denotes the relative positions of the crank-pin and center of driving-shaft when the parts have assumed the position shown by Figs. 5 and 5. In other words, by rocking the block at and the stud m carried thereby, back and forth, as described,the time of the descent of the needle-bar with relation to the rotation of the driving-shaft (from which both needle and shuttle receive their movements) is varied to compensate for the varying positions in the path of movement of the shuttle at which the point of the latter meets the needle. It will thus be seen that the horizontally-rocking block or lever on and its operating means, co-operating with the pitman to the lower end of which it is connected and with the crank which operates said pitman, constitute a compensating mechanism for keeping the needle and its coacting shuttle or loop-taking device in proper time, notwithstanding'the horizontal movements of the needle which would otherwise get the needle and shuttle or looper somewhat out of time, and the term compensating mechanism as employed in the claims of this specificationwill therefore be understood to mean a mechanism whereby the otherwise improper timing of a horizontally-movin g needle with relation to the movements of its co-operating loop-taking device will be compensated for and the parts be kept in proper time with each other.

I do not wish to be understood as limiting my invention to the particular construction of the compensating mechanism herein shown, as the details thereof may be varied widely without departing from the spirit of my invention.

It will be obvious from the construction shown by the drawings that the swinging movement of the stud. m is always in proportion to the swinging movements of the needle -bar frame, so that the greater the horizontal movements of the needle-bar the. greater will be the swinging movements ofthe stud m It'will therefore be understood that my improved compensating mechanism is automatic or self-regulating in its action, so that the time of the beginning of the up: ward movement of the needle is varied in proportion to the extent of its horizontal movements, and thus the eye of the needle will always assume the same or nearly the same horizontal position at the moment when the point of the shuttle orlooperis moving forward to take aloop of needle-thread, whatever may be the extent of the horizontal movement given to the needle. Thus with myimproved compensating mechanism applied thereto an overseaming-machine in which the needle is given wide horizontal movements may be run at any desired speed with no more danger of skipping stitches than an ordinary family machine.

I claim- 1. In a sewing-machine, the combination,

, driving-sh aft, and a horizontally rockin g lever with a needle-bar, needle, loop-takingdevice co-operating with said needle, means for reciprocating said needle-bar and needle both Vertically and horizontally, and a drivingshaft from which said needle and loop-taking device are both operated, of a compensating mechanism for causing the said needle and dle-bar and having ;a stud engaged by said pitman.

3. In a sewing-machine, the combination, with a needle-bar and needle and means for reciprocating the same horizontally, of a horizontally-reciprocating shuttle,'a driving-shat t 7 from which said needle-bar and shuttle are both operated, a pitman connected to said to which said needle-bar is attached and which is provided with a stud engaged by said pit- 'man.

4. In a sewing-machine, the combination, with the shuttle, the swinging needle b'ar frame, the driving-shaft, and means for operating said shuttle and frame from said shaft, of the pitman L, connected to said shaft, the stationary rod 0, and the rocking lever m, having a fork embracing said rod and having, also, the ball-headed stud m entering an aperture in said pitman, and the needle-bar attached to said block.

In testimony whereof I aflix my signature in presence of two witnesses.

PHILIP DIEHL.

Witnesses:

J. G. GREENE, L. B. MILLER. 

